python学习-10 运算符1

1.加+，减-，乘*，除/

例如：

a = 1
b = 2
c = a + b
print(c)

运算结果：

3

process finished with exit code 0

a = 1
b = 2
c = a - b
print(c)

运算结果：

-1

process finished with exit code 0

a = 1
b = 2
c = a * b
print(c)

运算结果：

2

process finished with exit code 0

a = 1
b = 2
c = a / b
print(c)

运算结果：

0.5

process finished with exit code 0

2.特殊的 幂 **， 取余%，//取商

例如：

a = 1
b = 2
c = a ** b
print(c)

运算结果：

1

process finished with exit code 0

a = 9
b = 2
c = a % b
print(c)

运算结果：

1

process finished with exit code 0

a = 9
b = 2
c = a // b
print(c)

运算结果：

4

process finished with exit code 0

3.in 和 not in 表示判断

判断某个东西是否在**里

例如：

in  

name = 'abd'        #'abd'  字符串  ； 'a' 字符
if 'a' in name:     #   如果a在name里
    print('ok')
else:
    print('error')

运行结果：

ok

process finished with exit code 0

ps:

子字符串：

name = 'abd'        #'abd'  字符串  ； 'a' 字符
#'bd'  子字符串或者叫子序列
if 'ad' in name:     #   如果a在name里
    print('ok')
else:
    print('error')

运行结果：

error

process finished with exit code 0

not in:

name = 'abd'
if 'a' not in name:
    print('ok')
else:
    print('error')

运行结果：

error

process finished with exit code 0